Structural adaptations are physical features of an organism. One structural adaptation of a bird is the change of the beak. Sometimes environments go through change or birds are forced out of their ecosystem and have to adapt to their new environment. Some birds are forced to change their beaks because of certain foods. A bird with a little beak could adapt to have a strong wide beak enough to crack bigger nuts. This helps the bird to survive so it can eat whatever is in its new environment. Once it reproduces in that environment the baby birds will have the same beak.